Of all the large companies that are now large internet players, do anyone particularly scare you in terms of how you data and track could be used? Amazon, Facebook, Twitter,
?
I think Facebook is the most evidently intrusive. They monitor all of your online activity pretty much and then shape your thoughts and such with targeted advertising. There will come a time in the future when the world decides it needs to take a step back from such intrusion in to their personal lives.
There are many who say that Facebook has been exposed to user information. There are a lot of junk applications on facebook that need to log in with people's accounts. user information is a simple matter for hackers. They will easily get information from everyone